Arc-light electrode.



R. P. WALKER.

ARC LIGHT ELECTRODE.

APPLICATION FILED DEC.3. I912.

l mnm May 8,1917

WETNESSES HNYENTOR HOBEF'RT F. ENALWEFK BY O 0 m dfifl/ww a ATTORNEYRQBERT I.

WALKER, 0F CLEVELAND, OHIO, ASSIG'NOR T0 PANY, 0F CLEVELAND, OHIO, ACORPQRATION OF NEW JERSEY.

ABC-LIGHT ELECTRODE.

Specification of Letters Patent.

Patented May 8, 191?.

Application filed December a, 1912. serial to. 784,656.

To all whom it may concern:

Be it known that I, ROBERT P. WALKER, a. citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented a certain new and useful Improvement in Arc-Light Electrodes,of which the following is a full, clear, and exact description.

My invention relates to a novel way of arranging the end of theconducting wire in cored carbons.

Cored carbons have a sistance and to overcome this objection it is thecommon practice to extend a brass, zinc or other metal wire throughoutthe length of the carbon. Such a low resistance conductor is disclosedin Patents 982,407 and 1,000,717. In the former the wire is bent atright angles to lie across the end of the core. In the latter the wireis flattened and bent down over the side of the electrode.

In making electrodes in accordance with these prior patents the wire wasfirst inserted in the channel, clipped ofi and bent acrom the core orflattened and bent down the side of the electrode. The core compositionwas afterward forced into the core opening. On account of the bent endof the wire being in the way, the composition was forced in from theother end of the electrode. The material, however, sometimes forced thewire outward when admitted from the arc end of the electrode. The bentend also furnishes too little surface contact as it is necessarilyshort. In addition it is diflicult to electroplate and solder the wireto the core. When the wire was flattened it often broke and destroyedthe continuity of the circuit. My improvement overcomes theseobjectionable features in a manner set forth in the followingdescription.

In the drawings: Figure 1 is an end view of an electrode with myimprovement.

Fig. 2 is a sectional view of the electrode end taken on the line A-A ofFig. 1.

The electrode has a carbonaceous shell 1 and a central hole 2 extendingthroughout its entire length. A small channel 3 runs parallel to the,hole 2 and communicates relatively high retherewith through a slot 4:.In some forms of electrodes the channel 3 does not open into thecentral. hole. The wire 5 has one end bent in the form of a ring 6. Thisring is preferably of larger diameter than the hole 2 so that the corecomposition 7 can be forced into or out of the hole without meeting anyinterference from the ring. After the wire is put in place thecomposition 15 forced into the hole from either end of the electrode. Italso enters the channel 3 through the slot at and envelops the Wire 5.Afterward the core 7 is compressed by pressing a leaving usually a spaceat the holder end as shown, though this may be dispensed with ifdesired. However, it has been found advantageous to compress thecompositlon in this way and the ring permits of this being readily done.

The electrode is afterward heated to dry the core and the and dipped insolder to integrally unite the ring to the carbon shell. Theelectroplate and solder is shown at 8.

When the wire is bent around to lie on the end of the shell the area ofcontact is greatly increased between the ring and coat of solder. Thecurrent can therefore flow from the holder through the solder and wirewithout undue generation of heat. The rlng itself in abutting againstthe bottom of the holder also furnished an increase in contact surfacetherebetween.

Having described my invention what I claim is:

An arc lamp electrode having two longitudinal channels,- flamingmaterlal in one of said channels and a metallic conductor in the otherchannel, the protruding end of said conductor being looped around thecore of fiagring material and secured to the electrode on In testimonywhereof, I hereunto aflix my signature.

THnonoRE I-IELMs, L. 0. Bnoons.

NATIUNAL CBUN COM- small rod through the ring 6 holder end iselectroplated

